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The Hyptis genus has more than 400 species, many of them being used in folk medicine to treat several conditions. Some anticancer compounds have been isolated from plants of this genus, and for that reason we decided to investigate the potential in vivo antitumor activity of extracts of leaves of Hyptis mutabilis with different polarities (hexane, methanol, water, and hot water) against two mice tumors: sarcoma 180 and Ehrlich solid tumor. Phytochemical analysis revealed strong presence of steroids, saponins, flavonoids (mainly dihydroflavanols), and catechins. Acute toxicity was perfomed according to the up-and-down method showing LD50 values ranging from 100 up to 2500 mg/kg. Antitumor activity was investigated using 10% of the LD50 for each extract. Methotrexate was used as positive control. Both aqueous extracts showed strong inhibition of tumor growth with values up to 70% of inhibition growth for sarcoma 180. Ehrlich solid tumor was only slight inhibited by hexane extract (38.6%). In conclusion, the aqueous extracts of H. mutabilis showed promising results against sarcoma 180 mice tumor.

Antitumor Activity of Leaves from Hyptis mutabilis (A. Rich.) Briq. (Lamiaceae) in Mice Bearing Tumor